/**
 *       Copyright (c) 2012 Lukas Zaruba
 *
 *   This file is part of Robot Playground.
 *
 *   Robot Playground is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Robot Playground is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with Robot Playground. If not, see <http://www.gnu.org/licenses/>.
 */
package net.zarubsys.commons.scripting.functions.strings;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;

import net.zarubsys.commons.scripting.IScriptFunction;
import net.zarubsys.commons.scripting.ParsedStatement;
import net.zarubsys.commons.scripting.ScriptingEnvironment;
import net.zarubsys.commons.scripting.ScriptingException;

/**
 * Based on scripting language from Media Solutions Slovakia, a.s.
 * @author Lukas Zaruba, lukas.zaruba@gmail.com
 */
public class TokenizeFunction implements IScriptFunction {

    public String getName() {
        return "tokenize";
    }

    public int getMinArgsNum() {
        return 1;
    }

    public int getMaxArgsNum() {
        return 2;
    }
    
    public Object execute(ScriptingEnvironment env, List<ParsedStatement> args) throws ScriptingException {
        String str = null; 
        String delim = "[,;]";
        Iterator<ParsedStatement> argsIter = args.iterator();
        if (argsIter.hasNext()) {
            ParsedStatement st = argsIter.next();
            str = (String) st.execute(env);
        }
        if (argsIter.hasNext()) {
            ParsedStatement st = argsIter.next();
            delim = (String) st.execute(env);
        }        
        Collection<String> ret = new ArrayList<String>();
        if (str == null) {
            return ret;
        }
        StringTokenizer tokenizer = new StringTokenizer(str, delim);
        while (tokenizer.hasMoreElements()) {
            String one = (String) tokenizer.nextElement();
            ret.add(one);
        }
        return ret;
    }

}
